Hi mama! That's great na nag-clearance na ang OB mo Honestly, pag 20 weeks ka na, swimming or water aerobics is sobrang recommended ng marami sa amin, super gentle on the joints at refreshing talaga lalo na mainit. Pati pregnancy yoga or prenatal pilates, a few of us tried yan and it really helped sa posture at breathing, plus nakakatulong din sa labor prep. If walking lang talaga kaya mo some days, that's perfectly fine din, consistency matters more than intensity pang pregnancy stage mo. Just always listen sa body mo and stop if nagsisimula kang mag-feel uncomfortable or dizzy, and check with your OB ulit if may new aches or anything unusual! Good luck sa journey mo, mama!